The following conventions are used in the synopsis of a
command: brackets ([ and ]) indicate optional parts. (In the synopsis of a
Tcl command, question marks (?) are used
instead, as is usual in Tcl.) Braces ({
and }) and vertical lines (|) indicate that you must choose one alternative.
Dots (...) mean that the preceding
element can be repeated.

Where it enhances the clarity, SQL commands are preceded by
the prompt =>, and shell commands are
preceded by the prompt $. Normally,
prompts are not shown, though.

An administrator is generally a
person who is in charge of installing and running the server. A
user could be anyone who is using, or
wants to use, any part of the PostgreSQL system. These terms should not be
interpreted too narrowly; this book does not have fixed
presumptions about system administration procedures.

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